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if statement help

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# 1  
Old 10-13-2008
if statement help
Hi Gurus,

New to Unix... What does the following if commands do?

if [ ! "$ORACLE_HOME" ]
then
. ${HOME}/.profile
fi

if [ ! "$COMMON_SOURCED" ]
then
. ./.common
fi

Also please give me some tutorials for Unix which I can start with. Also please gimmme examples for shell scripting.

Thanks and Regards,
# 2  
Old 10-13-2008
Quote:
Originally Posted by reksab_16
Hi Gurus,

New to Unix... What does the following if commands do?

if [ ! "$ORACLE_HOME" ]
then
. ${HOME}/.profile
fi

if [ ! "$COMMON_SOURCED" ]
then
. ./.common
fi

If the variable is empty or unset, then execute the code.

The more usual way to do it is:

Code:
if [ -z "$ORACLE_HOME" ]
then
. ${HOME}/.profile
fi

Quote:

Also please give me some tutorials for Unix which I can start with. Also please gimmme examples for shell scripting.

Here are some links to shell resources.
# 3  
Old 10-13-2008
Thanks a lot
johnson,

Thanks a lot for the needful.

what does the . ${HOME}/.profile and . ./.common do?

Thanks and Regards,
# 4  
Old 10-13-2008
Quote:
Originally Posted by reksab_16
what does the . ${HOME}/.profile and . ./.common do?

They source the files ${HOME}/.profile and ./.common.

That means that they are executed in the current shell and can therefore affect the environment (e.g., set variables) of that shell.
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